EGAL paper link is broken

The [Equality guide](https://clojure.org/guides/equality#_references)'s reference link to the EGAL paper appears to be broken. The current URL is `https://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=1?doi=10.1.1.23.9999&rep=rep1&type=pdf`, on Penn State's CiteSeerX. For me today this returns JSON `{"message":"Token is required"}`. I see two working URLs in the wild: - https://dl.acm.org/doi/pdf/10.1145/165593.165596 - via ACM digital library https://dl.acm.org/doi/10.1145/165593.165596 - https://raw.githubusercontent.com/awh/compsci-papers/master/Equal%20Rights%20for%20Functional%20Objects.pdf